Type 1 interferon signature and cytotoxic T lymphocyte activation targeted against sweat ducts in inflammatory acquired idiopathic generalized anhidrosis

This study examines the pathomechanism of acquired idiopathic generalized anhidrosis (AIGA), focusing on the role of type 1 interferon signature and cytotoxic T lymphocyte activation targeting sweat ducts. Involving 30 patients, it distinguishes between inflammatory (InfAIGA) and non-inflammatory (non-InfAIGA) groups. InfAIGA is marked by significant inflammation and sweat coil atrophy, while non-InfAIGA shows atrophy without inflammation. The findings suggest that immune privilege impairment in sweat ducts, similar to alopecia areata, may underlie AIGA, with cytotoxic T lymphocytes and type 1 interferons playing a key role. Additionally, serum carcinoembryonic antigen (CEA) elevation is linked to InfAIGA, highlighting its potential autoimmune nature.